[ROVERNET - UK] Fuel Pump woes

Slatskars slatskars at comcast.net
Tue Aug 2 07:34:59 BST 2005


Too much pressure will cause the float needles to open and result in 
flooding. 2 to 3 lbs should be sufficient. Not familiar with the 3500S. What 
type of fuel pump does it have as original, SU?

----- Original Message ----- 
From: "Lance La Certe" <lacpsyd at earthlink.net>
To: "Rovernet" <rovernet at lyris.ccdata.com>
Sent: Monday, August 01, 2005 8:36 PM
Subject: [ROVERNET - UK] Fuel Pump woes

> Hi Gang,
> Need help with fuel pump and discovered some info that may be helpful to
> others on the list.
> 1) 1970 3500S ----I'm in need of a new fuel pump.  Any suggestions for a
> state-side source (I will be contacting Ruth Burgess in Canada)
> 2) I need to know if anyone can give me the specs on the OEM fuel
> pump----specifically what are the upper and lower pressure limits (e.g.,
> 2.5 psi to 4.5 psi, etc).
> 3) For several months I have struggled with the car not being able to idle
> once the engine was at normal operating temperatures (especially in the
> summer when it has become especially hot).  After many helpful suggestions
> from the listers (e.g. blow out the return fuel lines; check the
> circulating coolant line which runs directly into the intake manifold;
> check your timing, etc)-----I discovered that when cold and just starting
> that my fuel pump was putting out only about 3 psi-----this was adequate 
> to
> keep things running smoothly, but after several minutes of running, as the
> fuel pump becomes warm it actually becomes less efficient (apparently most
> all fuel pumps operate this way----hence the listed range on the specs).
> As it turns out, when warm (and this has nothing to do with the engine
> temperature, but the pump temperature), it was only putting out 1 psi.  At
> this pressure there is not enough flow into the carb bowls to overcome the
> tendency for the gas to vaporize, especially when the engine is warm/hot.
> With a properly operating pump which is keeping the pressure up, it should
> overcome the tendency to vaporize and allow the engine to continue to 
> idle.
> 4) My mechanic is suggesting that I find a pump that will put out about 7
> psi when cold, so that when it heats up it will still be putting out about
> 3 psi to overcome the vaporizing problems.
> Any help with this would be appreciated.
> Lance La Certe,  Denver, CO
> Lance La Certe
> lacpsyd at earthlink.net
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